/**
 * Copyright (c) 2009, Christian Schneider
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * - Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *  - Neither the names of the authors nor the names of its contributors may
 *    be used to endorse or promote products derived from this software without
 *    specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package com.ruinwesen.patchmanager.client.repository;

import java.io.File;
import java.util.concurrent.Callable;

import name.cs.csutils.CSUtils;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.ruinwesen.patch.DefaultPatch;
import com.ruinwesen.patch.Patch;
import com.ruinwesen.patch.metadata.PatchMetadata;
import com.ruinwesen.patchmanager.swing.SwingPatchManagerUtils;

public class PatchDownloadTask implements Callable<File> {

    private static Log log = LogFactory.getLog(PatchDownloadTask.class);
    private Callable<File> getTask;
    private File dst;
    private String patchId;
    private boolean success = false;

    public PatchDownloadTask(Callable<File> getTask, File dst, String patchId) {
        this.getTask = getTask;
        this.dst = dst;
        this.patchId = patchId;
    }

    public synchronized boolean isSuccess() {
        return success;
    }

    public File getTargetFile() {
        return dst;
    }
    
    public File call() throws Exception {
        // get the (temporary) file
        File tmpFile = getTask.call(); 
        try {
            repack(tmpFile);
            synchronized(this) {
                success = true;
            }
        } catch (Exception ex) {
            if (log.isErrorEnabled()) {
                log.error("repack patch failed", ex);
            }
            throw ex;
        } finally {
            tmpFile.delete(); // delete temporary file
        }
        return dst;
    }

    /**
     * Reads the jar file, updates the metadata and writes the
     * changes to the final jar file
     * @param tmpFile
     */
    private void repack(File tmpFile) throws Exception {
        Patch patch = new DefaultPatch(tmpFile);        
        PatchMetadata meta = patch.getMetadata(); //  may throw exception
        meta.setPatchId(patchId);
        SwingPatchManagerUtils.updateMetadata(patch, meta);
        CSUtils.copy(patch.getLocalFile(), dst, true);
    }
    
}
